It's always interesting when the liturgical cycle and the temporal cycle collide and give us pause to reflect on Salvation History, God's plan for the world. Though we celebrate the timeless truth of the Logos, we also avow that Jesus became the Christ in time. The Annunciation to the Virgin Mary that she was to be the Mother of God and her acceptance of the role, her "fiat," is placed nine months before the liturgically celebrated date of Jesus' birth on December 25th. Yet, since the date of Easter is not fixed and varies according to the lunar/solar calendar, this year the feast is celebrated at the conclusion of the Octave of Easter.
Confusing perhaps, but a reminder that we all have one foot in time and one in eternity thanks to the Paschal Mystery of Christ in which we participate by our baptisms.